Question

a,5x(4+6*x)=290

b,(15x24-x):0,25=100:1/4

Các bn giúp mình nha

Answer 1

a, \(5\cdot\left(4+6\cdot x\right)=290\Rightarrow4+6\cdot x=290:5\Rightarrow4+6\cdot x=58\)

\(\Rightarrow6\cdot x=58-4\Rightarrow6\cdot x=54\Rightarrow x=54:6\Rightarrow x=9\)

b, \(\left(15\cdot24-x\right):0,25=100:\frac{1}{4}\Rightarrow\left(15\cdot24-x\right):\frac{1}{4}=100:\frac{1}{4}\)

\(\Rightarrow\left(15\cdot24-x\right):\frac{1}{4}=100\cdot\frac{4}{1}\Rightarrow\left(15\cdot24-x\right):\frac{1}{4}=400\)

\(\Rightarrow15\cdot24-x=400\cdot\frac{1}{4}\Rightarrow15\cdot24-x=100\Rightarrow360-x=100\)

\(\Rightarrow x=360-100\Rightarrow x=260\)

Answer 2

dấu sao là j vậy bn